Modeling Non-Stationary Temperature Fields When Constructing Mass Cast-in-Situ Reinforced-Concrete Foundation Slabs

Чепурненко, Антон; Nesvetaev, Grigory; Koryanova, Yuliya

doi:10.23968/2500-0055-2022-7-2-66-78

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…• The initial phase involves the application of loads to the load-bearing structures, bringing the building structures to their operational state [15]. During this first phase, there is a notable acceleration in the accumulation of physical deterioration in structures.…”

Section: Research Materials and Methodsmentioning

confidence: 99%

Organizational and technological aspects of industrial facility renovation

Zilberova,

Mailyan,

Novoselova

et al. 2023

E3S Web of Conf.

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The refurbishment of industrial structures is a multifaceted, resource-intensive, and financially demanding undertaking. The process entails various challenges that necessitate thorough consideration during the design phase. Such an approach is pivotal in devising effective solutions for the reconstruction of industrial facilities, regardless of the operational conditions, and can lead to substantial reductions in construction costs. The ultimate objective of such renovation endeavors is to enhance production capacity and overall enterprise profitability, mitigate adverse environmental effects, and ameliorate the quality of urban living environments.

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Section: Research Materials and Methodsmentioning

confidence: 99%

Organizational and technological aspects of industrial facility renovation

Zilberova,

Mailyan,

Novoselova

et al. 2023

E3S Web of Conf.

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show abstract

“…The temperature field was determined from the solution of the heat conduction differential equation by the finite element method in a one-dimensional setting according to the procedure given in [19,23]. The thickness of the slab was divided into 100 finite elements, and the number of time steps was taken equal to 800.…”

Section: Figure 5 Comparison Of the Curve Rt(t)mentioning

confidence: 99%

Simplified Method for Determining Thermal Stresses during the Construction of Massive Monolithic Foundation Slabs

Чепурненко

Turina

2023

CivilEng

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For massive monolithic foundation slabs, the problem of early cracking due to the intense heat release of concrete during the hardening process is relevant. The purpose of this article is to develop a simplified method for determining thermal stresses during the construction of massive monolithic foundation slabs. The proposed technique is based on the hypothesis of parabolic temperature distribution over the thickness of the structure at each moment of time. In addition to the parabolic distribution, the half-wave cosine distribution is also used. A hypothesis is also introduced about the same conditions of heat exchange with the environment on the lower and upper surfaces of the foundation. As a result, formulas are obtained that establish a direct relationship between thermal stresses and the temperature difference between the center and the surface. The solution to the test problem for the foundation slab is presented and compared with an alternative technique that does not use the hypothesis about the character of the temperature distribution over the thickness. Also, the inverse problem of determining the allowable temperature drop between the center and the surface of the structure is solved, at which the stresses on the upper surface at each moment of time will not exceed the tensile strength of concrete.

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Determination of Temperature Stresses during the Construction of Massive Monolithic Foundation Slabs, Taking into Account the Subgrade Compliance

Chepurnenko,

Turina,

Akopyan

2024

TOCIEJ

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Background The problem of early cracking caused by the heat of concrete hardening is relevant for massive reinforced concrete structures, including foundation slabs. The purpose of this work is to develop the methodology for determining temperature stresses during the construction of foundation slabs, taking into account the interaction with the subgrade. Methods The Pasternak elastic foundation model with two-bed coefficients is used for the soil. The temperature of the foundation slab is considered a function of only one coordinate z (temperature changes only along the thickness of the slab). As a result, to determine the stress-strain state of the slab, a fourth-order differential equation for deflection was obtained. A technique for numerically solving the resulting equation using the finite difference method is proposed. The calculation of the stress-strain state is preceded by the calculation of the temperature field, which is performed by the finite element method in a simplified one-dimensional formulation. Results The solution to the test problem is presented for a constant modulus of elasticity of concrete over time. The results were compared with finite element calculations in a three-dimensional formulation in the ASNYS software. The calculation was also performed taking into account the dependence of the mechanical characteristics of concrete on its degree of maturity. In this case, the picture of the stress-strain state changes significantly. The proposed method was also successfully tested on experimental data. Conclusion The proposed approach can significantly save calculation time compared to the finite element analysis in a three-dimensional setting.

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Modeling Non-Stationary Temperature Fields When Constructing Mass Cast-in-Situ Reinforced-Concrete Foundation Slabs

Cited by 3 publications

References 15 publications

Organizational and technological aspects of industrial facility renovation

Organizational and technological aspects of industrial facility renovation

Simplified Method for Determining Thermal Stresses during the Construction of Massive Monolithic Foundation Slabs

Determination of Temperature Stresses during the Construction of Massive Monolithic Foundation Slabs, Taking into Account the Subgrade Compliance

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